Longman Dictionary of Contemporary English - piggy

~1 n 1 a word meaning a pig, used especially by or to children 2 piggy in the middle BrE a) informal someone who is between two opposing groups or people and is unable to influence either side b) a game in which a ball is thrown between two people who try to prevent a third person in the middle from catching it; keep­away AmE ~2 adj 1 like a pig  (little piggy eyes) 2 informal wanting or taking more food than you really need; greedy  (Don't be so piggy, Ed.)